孤立性肺結節(jié)：良性與惡性對比-全文預覽
【正文】 single intraparenchymal lesion less than 3 cm in size and not associated with atelectasis or lymphadenopathy.A lesion greater than 3 cm in diameter is called a mass.孤立性結節(jié)定義為小于 3cm，不伴有肺不張、淋巴結轉移，大于 3cm的為腫塊n This distinction is made, because lesions greater than 3 cm are usually malignant, while smaller lesions can be either benign or malignant. n 以 3cm為界，因為大于 3cm的通常是惡性的，而小于 3cm的可能是良性或惡性。n 胃腸間質瘤的病人化療后可以表現(xiàn)為中心性或苞米花鈣化。n Partly solid lesions with groundglass ponents had a malignancy rate of 63%. 部分實性和磨玻璃樣密度是惡性結節(jié)的可能性事 63%n Nonsolid only groundglass lesions had a malignancy rate of 18%. 完全磨玻璃樣密度結節(jié) 16%是惡性結節(jié)n Only solid lesions had a malignancy rate of only 7%.完全實性結節(jié)是僅 7%是惡性結節(jié)n Partly solid nodule containing groundglass ponent most likely to be malignantn On the far left a lesion that only has a groundglass appearance and next to it a lesion that has both groundglass and solid ponents.The likelihood of malignancy is 1:5 for the lesion on the far left and 2:3 for the lesion with both groundglass and solid ponents.n LEFT: 1 in 5 malignant左邊圖是 5個病灶 1個為惡性結節(jié)n RIGHT: 2 in 3 malignantn 右邊圖是 3個病灶 2個為惡性結節(jié)Contrast enhancement對比增強n Contrast enhancement less than 15 HU has a very high predictive value for benignity (99%).After a baseline scan, 4 consecutive scans at 1 minute interval are performed.對比增強小于 15HU是良性病變的可能性（99%）n This applies only for nodules with the following selection criteria:n Nodule 5mm 結節(jié)大于 5mmn Relatively spherical 相對圓
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